ios - UITextField textInputView message sent to deallocated instance -

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i have crashes occur when tap on uitextfield. have 2 controllers, let's a , b. when show controller b modally in controller a, , tap on uitextfield ok. dismiss controller b, , present again. time when click on uitextfield crash occurs. when enabled nszombie in scheme, there message of crash - -[uitextfield textinputview]: message sent deallocated instance.

i have no uitextfielddelegate set on uitextfield. when tried debug instruments -> zombies, there no source code (unavailable) when double click release/retain history line.

my scheme's build configuration debug. xcode version 7.2.1. crashes occur on ios 8. ios 9 fine.

ps: when try re-symbolicate app, see there 1 missing system frameworks dyld. press locate button , open dsym file of debug app, error occurs message "the specified path didn't locate dsym of selected libraries."

update 1:

a controller:

#import <uikit/uikit.h>  @interface : uiviewcontroller @end  #import "a.h" #import "roundedbutton.h"  @interface () @property (weak, nonatomic) iboutlet roundedbutton *signinbutton; @end  @implementation  - (void)viewdidload {     [super viewdidload];      [self configui]; }  - (void)viewwillappear:(bool)animated {     [super viewwillappear:animated];      [[uiapplication sharedapplication] setstatusbarstyle:uistatusbarstyledefault animated:yes];     [self.navigationcontroller setnavigationbarhidden:yes animated:yes]; }  - (uistatusbarstyle)preferredstatusbarstyle {     return uistatusbarstyledefault; }  - (void)didreceivememorywarning {     [super didreceivememorywarning];     // dispose of resources can recreated. }  #pragma mark - segue  - (void)prepareforsegue:(uistoryboardsegue *)segue sender:(id)sender {     if ([segue.identifier isequaltostring:@"signin"]) {      } }  #pragma mark - config ui  - (void)configui {     // setup ui     }  - (void)dealloc {     nslog(@"%@ deallocated", nsstringfromclass([self class])); }  @end

b controller:

#import <uikit/uikit.h>  @interface b : uiviewcontroller @end  #import "b.h" #import "skformtextfield.h" #import "roundedbutton.h"  @interface b ()  @property (weak, nonatomic) iboutlet uitextfield *textfield; @property (weak, nonatomic) iboutlet roundedbutton *signinbutton; @end  @implementation b {     skalertview *alertview; }  - (void)viewdidload {     [super viewdidload];      [self configui]; }  - (void)viewwillappear:(bool)animated {     [super viewwillappear:animated]; }  #pragma mark - actions  - (ibaction)cancelsignin:(id)sender {     [self dismissviewcontrolleranimated:yes completion:nil]; }  #pragma mark - config ui  - (void)configui {     self.navigationcontroller.navigationbarhidden = yes;      self.textfield.securetextentry = true;     self.textfield.autocorrectiontype = uitextautocorrectiontypeno; }  - (void)dealloc {     nslog(@"%@ deallocated", nsstringfromclass([self class])); }  @end

update 2:

when call uitextfield, self.textfield.text = @"hello, world!";, there no crash. when pan/touch uitextfield or call [self.textfield becomefirstresponder]; crashes.

finally, found reason of crashes. have uitextfield extension called uitextfield (autosuggestion) called dealloc method remove own observers.

code sample:

/* .h file */ #import <uikit/uikit.h> // protocol @interface uitextfield (autosuggestion) // properties , methods @end  /* .m file */ #import "uitextfield+autosuggestion.h" #import <objc/runtime.h> @implementation uitextfield (autosuggestion) - (void)observetextfieldchanges {     self.layer.maskstobounds = no;     [[nsnotificationcenter defaultcenter] addobserver:self selector:@selector(toggleautosuggestion:) name:uitextfieldtextdidchangenotification object:self];     [[nsnotificationcenter defaultcenter] addobserver:self selector:@selector(hideautosuggestion) name:uitextfieldtextdidendeditingnotification object:self];     [[nsnotificationcenter defaultcenter] addobserver:self                                              selector:@selector(getkeyboardheight:)                                                  name:uikeyboarddidshownotification                                                object:nil]; }  - (void)dealloc {     [[nsnotificationcenter defaultcenter] removeobserver:self name:uitextfieldtextdidchangenotification object:nil];     [[nsnotificationcenter defaultcenter] removeobserver:self name:uitextfieldtextdidendeditingnotification object:nil];     [[nsnotificationcenter defaultcenter] removeobserver:self name:uikeyboarddidshownotification object:nil]; } // other methods @end

after removed dealloc method crashes disappeared. therefore decided find new way implement autosuggestion feature.

the interesting thing didn't import header file in code anywhere, crashes occurred.


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